Thermocouples Tu-Pak - Athena Controls - (Version JPG) - PDF Catalogue | Technical Documentation

See other catalogues for Athena Controls

Relay, Controller, Thermocouple, Process controller, Power relay

Text version of the page

Tu-Pak® is Athena's trademark for metal-sheathed, mineral-insulated (MI) thermocouple material. It is a departure from the traditional assembly of tubes, wires and insulators. It has a unit-construction with no replacement parts. Tu-Pak has improved thermal response, greater flexibility and, size for size, it is longer lasting than traditional types.

Tu-Pak® Dimensions and Wire Sizes

Sheath Outside Nominal Approximate Nom. Conductor Outside Diameter Wall Wire Diameters, in.

Diameter Tolerance, ±in. Thickness, in. B&S gauge 2-wire 4-wire


0.062	0.002	0.010	29	0.011	0.006
0.125	0.002	0.018	24	0.022	0.011
0.188	0.003	0.025	18	0.032	0.022
0.250	0.003	0.032	17	0.040	0.032
0.313	0.003	0.040	16	0.051	0.040
0.375	0.003	0.049	14	0.064	0.051

TuPak Sheath Material Limitations


Recommended Limit
			Recommended	Continuous
	Melting	Maximum	Operating	Maximum
Materials	Point, °F/°C	in Air, °F/°C	Atmosphere	Temp., °F/°C
Stainless Steel:
304	2560/1404	1920/1049	ORNV	1650/899
309	2560/1404	2000/1093	ORNV	2000/1093
310	2560/1404	2000/1093	ORNV	2100/1149
316	2500/1371	1650/899	ORNV	1700/927
321	2550/1399	1650/899	ORNV	1600/871
347	2600/1427	1680/916	ORNV	1600/871
430	2700/1482	1550/843	ORNV	1200/649
446	2700/1482	2000/1093	ORNV	2000/1093
Inconel	2550/1399	2000/1093	ONVÎ	2100/1149
Inconel X	2620/1438	1500/816	ONVÎ	2200/1204
Platinum	3217/1770	3000/1649	ONÎ	3000/1649
Pt-Rh 10% 3362/1850		3100/1704	ON	3100/1704

Tu-Pak® Suggested Upper Temperature Limits for Sheathed Thermocouples (per ASTM E608)


Nom. Dia. (in)	0.062	0.125	0.188	0.250
Nom. Wall (in)	0.010	0.018	0.025	0.032
Type K/N (°F/°C)	1690/920	1960/1070	2100/1150	2100/1150
Type J (°F/°C)	825/440	970/520	1150/620	1330/720
Type E (°F/°C)	950/510	1200/650	1350/730	1510/820
Type T (°F/°C)	500/260	600/315	700/370	700/370

Symbols describing atmospheres are O = oxidizing; R = reducing; N = neutral; V = vacuum; Î = Very sensitive to sulfur corrosion.

Measuring Junctions

Grounded Junction - The sheath and the thermocouple wires are welded together, forming a completely closed measuring junction. Recommended in the presence of liquids, moisture, gas, or high pressure. The thermocouple is protected from the environment. Response time approaches that of an exposed junction.

Ungrounded Junction - The thermocouple junction is insulated from the welded measuring junction closure. Recommended for applications where stray EMFs could affect the instrument reading and for frequent/rapid temperature cycling. Response time is slower than a grounded junction.

Exposed Junction - The thermocouple junction is not protected by a welded closure. Insulation is sealed against liquid or gas penetration. Provides fastest response time. Not recommended for applications that are corrosive.

(MD

Thermocouples Tu-Pak - Athena Controls - #1

Relay, Controller, Thermocouple, Process controller, Power relay